libc/src/stdio/generic/fgetc_unlocked.cpp

   1 //===-- Implementation of fgetc_unlocked ----------------------------------===//
   2 //
   3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
   4 // See https://llvm.org/LICENSE.txt for license information.
   5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
   6 //
   7 //===----------------------------------------------------------------------===//
   8
   9 #include "src/stdio/fgetc_unlocked.h"
  10 #include "src/__support/File/file.h"
  11
  12 #include "hdr/types/FILE.h"
  13 #include "src/__support/macros/config.h"
  14 #include "src/errno/libc_errno.h"
  15 #include <stddef.h>
  16
  17 namespace LIBC_NAMESPACE_DECL {
  18
  19 LLVM_LIBC_FUNCTION(int, fgetc_unlocked, (::FILE * stream)) {
  20   unsigned char c;
  21   auto result =
  22       reinterpret_cast<LIBC_NAMESPACE::File *>(stream)->read_unlocked(&c, 1);
  23   size_t r = result.value;
  24   if (result.has_error())
  25     libc_errno = result.error;
  26   if (r != 1)
  27     return EOF;
  28   return c;
  29 }
  30
  31 } // namespace LIBC_NAMESPACE_DECL